Improvement in permutation-locks



.FEYERS. FHOWLITHDGRAPHER. WASHINGTON. D. C.

SAMUEL LOYD, 0F NEW YORK, N. Y.

Letters Patent No. 112,724, dated March 14, 1871.

IMPROVEMENT iN PERMU'I'TlONiOCKS.

The Schedule referred to h1 these Letters Patent and making part of the name.

Beit known that I, SAMUEL LOYD, of the city, county, and State of New York, have invented certain Improvements in Safety-Locks; and I do hereby declare that the following is a full, clear, and exact description of' the construction and operation of the same, reference being had to the annexed drawing making a part of this specification.

Nature cm1 Objects of the Invention.

The particular' feature of my invention is the construction of a trunk or desk-lock that may Yhe used without a key, which is simple in its parts and very compact, combining strengthv and durability, which I accomplish by .the combination of a lock-case, disktumblers, holt-plate with a knob attached in and throughthe center of the lock for operating the same.

I also provide the lock with four small knobs, on the shafts of which I attach notched wheels corresponding with the openings in theeenter of the tumblers, so as to rotate the tumbler-s by turning these Small knobs. v Y

To the bolt-plate is attached four guard-pins, which t into the slots or gatings in the tumblers when the tumblers are turned or rotated to the proper position to admit them. Y

In the drawing- Figure l is a iront View of the lock.

Figure 2, a side view of the knob. v

Figure 3, a back View of the lock with the boltplate turned in position for changing the combination.

Figure 4,A a back view with the bolt-plate removed, showing the tnmblers and their gatings that receive the guard-pins when the lock is operated.

Figure 5, aview of the inner surface of the boltplate, showing the guard-pins on the same.

A is ythe lock-case.

the knob attached to and operates the boltpiate.

C, the bolt-plate.

I), the disk tumblers.

b b b b, small knobs that actuate the'turnblers.

e e e e, notched wheels attached to the shafts of` knobs b, and fitting into a corresponding opening in the tumblers.

y g g g, the guard-pins attached to the bolteplate, as shown in fig. 5.

The lock-case A is ont and formed of heavy sheet metal, and of suitableshape to accommodate ,the purpose for which it is designed, whether for atrunk, desk, or door, with the necessary perforations to accommodate the knobs with their shafts running th rough it, as shown in iig. l ofthe drawing.

In this lock-case I place four disk-tumblers, which are stampe-d out of sheet metal, asshown at D, having openings in their centers notched to receive the notched wheels e, on the shafts of the small knobs b, which secure them in place.

These tumblers D also are provided with slots or gatings, as shown at f.

I tiren provide the bolt-plate O, which is also stamped ont of sheet metal, and is provided with guard-pins g Ato t the gatings in the disk-tnmblers, as shown in iig. 5, and attach this bolt-plate by an opening in its center, in which I insert the shaft of the knob B and rivet it securely on the same, over the inside faces of the disk-tumblers, but leaving it free to turn when operated by the knob B.

The face of the lock is provided with four alphabets stamped on it, surrounding the small knobs b, as shown in iig. l of the drawing, for the purpose of a combination to set the loelnto, by which the saine may Ahe opened.

I claim as my invention-flhe bolt-plate C, provided with spellings I-I H H H, in combination with the notched wheels e, arranged within the tumblers D, substantially as shown and described.

SAMUEL LOYD. Witnesses:

L. H. GNO, JOHN lOsnmnrmr. 

